Downpipes, which did you go with?

[infeKteDx]

Just like it says, did you guys go with just the upper downpipe, or did you get something like the ATP setup:

ATP 3" Long Downpipe - Mazdaspeed3—|—MazdaSpeed3 Exhaust—|—MazdaSpeed 3—|—Mazdaspeed Parts - Mazda Speed Store

Which do you find easier to deal with?

I ask because I want to get rid of both cats, but is it necessary to get rid of the lower downpipe as well?

I don't think I'm understanding the way this exhaust works lol. Is the upper / lower downpipe BOTH cats? or does the secondary cat come later?

[Postulio4joo]

The 2nd cat is removed with a test pipe. The DP i believe contains the primary. I had a ATP test pipe until i recently purchased a CNT full pipe. No cats in CA is the way to roll.

[infeKteDx]

so does it go like this:

upper restrictive DP -- lower DP (with first catt) -- secondary catt -- catt back exhaust?

[Jake5713]

no
the first cat is in the downpipe
the second cat is in the test pipe section
both are restrictive
then catback
basically the same exact thing as this

[MS3inDC]

Full-Race two-piece vband dp...?


If you want flexibility, get the shorty dp and a tp. You can add a resonator/high-flow cat if you want, or leave it castless.

If your not going to mess with it again get the long dp. You can have a high-flow cat welded in if you want pre-install. But it's harder to swap out if you plan on a lot of switching... well, harder if you have no lift or air tools

[Sid3wayS]

You would understand if you search and read.
Here: http://www.mazdaspeedforum.org/forum/foru...-thread-99627/